Implement the use of NextAuth to save the session during registration by utilizing the email and password

When registering a user using email, password and username and storing in mongodb, I am looking to incorporate Next Auth to store sessions at the time of registration. My goal is to redirect the user in the same way during registration as they would experience if logged in, with the session being stored. However, I am struggling to find a solution for this during the registration process. Do I need to make the user login again after registering in order to manage all authentication-related tasks using Next Auth?

Below is my registration API code:

import type { NextApiRequest, NextApiResponse } from "next";
import connectMongo from "@/lib/mongodb";
import User from "@/models/usersSchema";
import { z } from "zod";
import { hash } from "bcryptjs";
import jwt from "jsonwebtoken";
import { UserSignUpSchema } from "@/lib/UserSchema";

let secret: string = "";

if (process.env.JWT_SecR3T) {
  secret = process.env.JWT_SecR3T;
}

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method !== "POST") {
    return res.status(405).end();
  }
  try {
    const data = req.body;
    const parsedData = await UserSignUpSchema.safeParse(data);
    if (parsedData.success === false) {
      return res
        .status(400)
        .json({ error: parsedData.error.issues[0].message });
    } else {
      await connectMongo();
      const { username, password, email } = parsedData.data;
      //@ts-ignore
      let existingUser = await User.findOne({ email: email });
      if (existingUser) {
        return res.status(409).json({ error: "Email aready exists" });
      }
      const hashedPassword = await hash(password, 12);
      const userObj = {
        username: username,
        password: hashedPassword,
        email: email,
      };
      const user = new User(userObj);
      await user.save();
      const token = jwt.sign({ email: email }, secret, { expiresIn: "1h" });
      return res
        .status(200)
        .json({ message: "user successfully created", token });
    }
  } catch (error) {
    return res.status(500).json("Internal Server Failure");
  }
}

Answer №1

If you're working with NextJS, it's recommended to integrate the next/auth handler into your API for authentication.

Start by creating a new file at

/app/api/auth/[...nextauth]/route.ts
and add the following code:

import type { NextApiRequest, NextApiResponse } from "next"
import NextAuth from "next-auth"

export default async function auth(req: NextApiRequest, res: NextApiResponse) {

  // Add any custom logic here before passing the request to `NextAuth`

  return await NextAuth(req, res, {

    // INSERT NEXT AUTH OPTIONS HERE

  })
}

To get started smoothly and effectively, refer to the official documentation for detailed instructions: https://next-auth.js.org/getting-started/example#existing-project

Answer №2

Alright @zanea, the answer provided is accurate, but I will provide more detailed steps on how to proceed.

Once you have created the file

/app/api/auth/[...nextauth]/route.ts
,

In either your SignUp Route Page or SignIn Route Page,

Import the SignIn function from "next-auth/react" and send all user credentials to nextAuth by calling

signIn(
'credentials', 
 {
   ... Include user credentials like email and password
   callbackUrl: "/on-boarding" // Redirect URL after authentication
   })

In your

/app/api/auth/[...nextauth]/route.ts
, set up a CredentialProvider to handle server fetching.

  CredentialsProvider({
            async authorize(credentialPayload: any) {
                 // User credentials passed into SignIn Function
              
               ...MongoDB logic for obtaining user token
                
                //Return data from MongoDB Database for storing in userSession
                return data;

            },
        }),

Further, in the same

/app/api/auth/[...nextauth]/route.ts
, include various callbacks for session persistence and storage.

 callbacks: {
        async signIn({ account, user }) {
            if (account) {
                account.userData = user;   
            }
            return true;

        },

        async jwt({ token, account, trigger, session }) {
            if (account) {
                  if (account.provider === "credentials") { 
                    
                    if (account.userData) {
                        token = account.userData;
                    } else {
                        token = {
                            accessToken: null,
                            isAuthError: true,
                        }
                    }
                }
            }

            return token
        },
        async session({ session, token, }) {

            session = {
                ...token,
            };
            return session
        }
    }

To better comprehend the process, I recommend referring to the documentation here and understanding the purpose of each API for customization.

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